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simon pure

simon pure idiom

Absolutely genuine, quite authentic, as in That laboratory test was simon pure; none of the specimens was adulterated. This expression comes from the name of a character in a play, Susannah Centilivre's A Bold Stroke for a Wife (1717), who is the victim of an impersonation but turns up in the end and proves that he is “the real Simon Pure.”

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.